diff --git a/package.json b/package.json
index 3964573..d6f6a4f 100644
--- a/package.json
+++ b/package.json
@@ -34,7 +34,7 @@
     "eslint-plugin-import": "2.29.1",
     "eslint-plugin-jsdoc": "48.2.3",
     "http-server": "14.1.1",
-    "hysnappy": "0.3.0",
+    "hysnappy": "0.3.1",
     "typescript": "5.4.5",
     "vitest": "1.5.2"
   }
diff --git a/src/assemble.js b/src/assemble.js
index be619be..0e15bf0 100644
--- a/src/assemble.js
+++ b/src/assemble.js
@@ -8,13 +8,13 @@
  * @param {number[] | undefined} definitionLevels definition levels, max 3
  * @param {number[]} repetitionLevels repetition levels, max 1
  * @param {ArrayLike<any>} values values to process
- * @param {boolean} isNull can an entry be null?
+ * @param {boolean} isNullable can entries be null?
  * @param {number} maxDefinitionLevel definition level that corresponds to non-null
  * @param {number} maxRepetitionLevel repetition level that corresponds to a new row
  * @returns {any[]} array of values
  */
 export function assembleObjects(
-  definitionLevels, repetitionLevels, values, isNull, maxDefinitionLevel, maxRepetitionLevel
+  definitionLevels, repetitionLevels, values, isNullable, maxDefinitionLevel, maxRepetitionLevel
 ) {
   let valueIndex = 0
   /** @type {any[]} */
@@ -53,7 +53,7 @@ export function assembleObjects(
         throw new Error('parquet assembleObjects: currentContainer is undefined')
       }
       currentContainer.push(values[valueIndex++])
-    } else if (isNull) {
+    } else if (isNullable) {
       if (def) {
         // TODO: Go up maxDefinitionLevel - def - 1 levels to add null
         for (let j = def; j < maxDefinitionLevel - 1; j++) {
diff --git a/src/column.js b/src/column.js
index a3bca29..4dcf98d 100644
--- a/src/column.js
+++ b/src/column.js
@@ -169,11 +169,9 @@ export function getColumnOffset(columnMetadata) {
 }
 
 /**
- * @typedef {import('./types.js').PageHeader} PageHeader
- * @typedef {import('./types.js').CompressionCodec} CompressionCodec
  * @param {Uint8Array} compressedBytes
  * @param {number} uncompressed_page_size
- * @param {CompressionCodec} codec
+ * @param {import('./types.js').CompressionCodec} codec
  * @param {Compressors | undefined} compressors
  * @returns {Uint8Array}
  */
diff --git a/src/constants.js b/src/constants.js
index ca2e3a2..17bd3f2 100644
--- a/src/constants.js
+++ b/src/constants.js
@@ -1,6 +1,5 @@
 /**
- * @typedef {import('./types.js').ParquetType} ParquetTypeType
- * @type {ParquetTypeType[]}
+ * @type {import('./types.js').ParquetType[]}
  */
 export const ParquetType = [
   'BOOLEAN',
@@ -33,8 +32,7 @@ export const FieldRepetitionType = [
 ]
 
 /**
- * @typedef {import('./types.js').ConvertedType} ConvertedTypeType
- * @type {ConvertedTypeType[]}
+ * @type {import('./types.js').ConvertedType[]}
  */
 export const ConvertedType = [
   'UTF8',
@@ -62,8 +60,7 @@ export const ConvertedType = [
 ]
 
 /**
- * @typedef {import('./types.js').LogicalTypeType} LogicalTypeType
- * @type {LogicalTypeType[]}
+ * @type {import('./types.js').LogicalTypeType[]}
  */
 export const logicalTypeType = [
   'NULL',
@@ -95,8 +92,7 @@ export const CompressionCodec = [
 ]
 
 /**
- * @typedef {import('./types.js').PageType} PageType
- * @type {PageType[]}
+ * @type {import('./types.js').PageType[]}
  */
 export const PageType = [
   'DATA_PAGE',
diff --git a/src/convert.js b/src/convert.js
index 9c301ce..364d7de 100644
--- a/src/convert.js
+++ b/src/convert.js
@@ -1,14 +1,10 @@
-/**
- * @typedef {import('./types.js').SchemaElement} SchemaElement
- */
-
-const dayMillis = 86400000000000 // 1 day in milliseconds
+const dayMillis = 86400000000000 // 1 day in ms
 
 /**
  * Convert known types from primitive to rich.
  *
  * @param {any[]} data series of primitive types
- * @param {SchemaElement} schemaElement schema element for the data
+ * @param {import('./types.js').SchemaElement} schemaElement schema element for the data
  * @returns {any[]} series of rich types
  */
 export function convert(data, schemaElement) {
diff --git a/src/datapageV2.js b/src/datapageV2.js
index a2e0a58..e09d860 100644
--- a/src/datapageV2.js
+++ b/src/datapageV2.js
@@ -10,10 +10,9 @@ import { readVarInt, readZigZag } from './thrift.js'
  * @typedef {import("./types.d.ts").ColumnMetaData} ColumnMetaData
  * @typedef {import("./types.d.ts").Compressors} Compressors
  * @typedef {import("./types.d.ts").DataPageHeaderV2} DataPageHeaderV2
- * @typedef {import("./types.d.ts").PageHeader} PageHeader
  * @typedef {import("./types.d.ts").SchemaElement} SchemaElement
  * @param {Uint8Array} compressedBytes raw page data (should already be decompressed)
- * @param {PageHeader} ph page header
+ * @param {import("./types.d.ts").PageHeader} ph page header
  * @param {SchemaElement[]} schema schema for the file
  * @param {ColumnMetaData} columnMetadata metadata for the column
  * @param {Compressors | undefined} compressors
diff --git a/src/metadata.js b/src/metadata.js
index 249eb2c..f1919e8 100644
--- a/src/metadata.js
+++ b/src/metadata.js
@@ -168,9 +168,8 @@ export function parquetMetadata(arrayBuffer) {
 /**
  * Return a tree of schema elements from parquet metadata.
  *
- * @typedef {import("./types.d.ts").SchemaTree} SchemaTree
  * @param {FileMetaData} metadata parquet metadata object
- * @returns {SchemaTree} tree of schema elements
+ * @returns {import("./types.d.ts").SchemaTree} tree of schema elements
  */
 export function parquetSchema(metadata) {
   return schemaElement(metadata.schema, [])
diff --git a/test/helpers.js b/test/helpers.js
index 066ea6c..b35cf1a 100644
--- a/test/helpers.js
+++ b/test/helpers.js
@@ -14,9 +14,8 @@ export async function readFileToArrayBuffer(filePath) {
 /**
  * Wrap .parquet file in an AsyncBuffer
  *
- * @typedef {import('../src/types.js').AsyncBuffer} AsyncBuffer
  * @param {string} filePath
- * @returns {AsyncBuffer}
+ * @returns {import('../src/types.js').AsyncBuffer}
  */
 export function fileToAsyncBuffer(filePath) {
   return {
diff --git a/test/readFiles.test.js b/test/readFiles.test.js
index c05a596..c704009 100644
--- a/test/readFiles.test.js
+++ b/test/readFiles.test.js
@@ -6,8 +6,7 @@ import { toJson } from '../src/utils.js'
 import { fileToAsyncBuffer, fileToJson } from './helpers.js'
 
 /**
- * @typedef {import('../src/types.js').Compressors} Compressors
- * @type {Compressors}
+ * @type {import('../src/types.js').Compressors}
  */
 const compressors = {
   GZIP: (/** @type {Uint8Array} */ input, /** @type {number} */ outputLength) => {